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Title: Effects of prior hydrogenation on the structure and properties of thermally nanocrystallized silicon layers
Author: Achiq, Abdellatif
Rizk, Richard
Gourbilleau, Fabrice
Madelon, R.
Garrido Fernández, Blas
Pérez Rodríguez, Alejandro
Morante i Lleonart, Joan Ramon
Keywords: Cristal·lització
Superfícies (Física)
Surfaces (Physics)
Issue Date: 1-Jun-1998
Publisher: American Institute of Physics
Abstract: Nanocrystalline silicon layers have been obtained by thermal annealing of films sputtered in various hydrogen partial pressures. The as-deposited and crystallized films were investigated by infrared, Raman, x-ray diffraction, electron microscopy, and optical absorption techniques. The obtained data show evidence of a close correlation between the microstructure and properties of the processed material, and the hydrogen content in the as-grown deposit. The minimum stress deduced from Raman was found to correspond to the widest band gap and to a maximum hydrogen content in the basic unannealed sample. Such a structure relaxation seems to originate from the so-called "chemical annealing" thought to be due to Si-H2 species, as identified by infrared spectroscopy. The variation of the band gap has been interpreted in terms of the changes in the band tails associated with the disorder which would be induced by stress. Finally, the layers originally deposited with the highest hydrogen pressure show a lowest stress-which does not correlate with the hydrogen content and the optical band gap¿and some texturing. These features are likely related to the presence in these layers of a significant crystalline fraction already before annealing.
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It is part of: Journal of Applied Physics, 1998, vol. 83, num. 11, p. 5797-5803
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ISSN: 0021-8979
Appears in Collections:Articles publicats en revistes (Enginyeria Electrònica i Biomèdica)

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